CVE-2020-26117 Information

Description

In rfb/CSecurityTLS.cxx and rfb/CSecurityTLS.java in TigerVNC before 1.11.0 viewers mishandle TLS certificate exceptions. They store the certificates as authorities meaning that the owner of a certificate could impersonate any server after a client had added an exception.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Reference

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00025.html http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00024.html https://bugzilla.opensuse.org/show_bug.cgi?id=1176733 https://github.com/TigerVNC/tigervnc/commit/20dea801e747318525a5859fe4f37c52b05310cb https://github.com/TigerVNC/tigervnc/commit/7399eab79a4365434d26494fa1628ce1eb91562b https://github.com/TigerVNC/tigervnc/commit/b30f10c681ec87720cff85d490f67098568a9cba https://github.com/TigerVNC/tigervnc/commit/f029745f63ac7d22fb91639b2cb5b3ab56134d6e https://github.com/TigerVNC/tigervnc/releases/tag/v1.11.0 https://lists.debian.org/debian-lts-announce/2020/10/msg00007.html

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

NONE

Base Severity

8.1